Langasteb



Patented Apr. 28, 1885I @my j way , j ilniirnn STATES Pnrnnr Ormea.

VILLIAW HARGRFIAVES AND VILLIAM INGLIS, OF BOLTON, COUNTY OF LANCASTER, ENGLAND.

ENGINE FOR STARTING OR TURNING LARGE ENGINES.

SPECIFICATION forming part of Letters Patent No. 316,776, dated April 28'l 1885.

Application filed August 4, 1884. (No model.) Patentcd in England April 23, 1884, No. 6,702; in France June 14. 1884, 'NoA 162,754, and in Belgium June 16, 1884, No.65,487.

.To all whom, it may concern:

Be it known that we, WILLIAM Hnnennfivns and WILLIAM INeL1s,subj ects of the Queen of Great Britain and Ireland,l and residing at Bolton, in the county of Lancaster, England,

have invented certain Improvements in En gines for Starting or Turning Large Engines, (for which we have applied for the following patents: British, dated April 23, 1884, No. 6,702; French, dated June 14,1884,N0. 162,754; Belgian, dated J une 16, 1884, No. 65,487,) of which the following is a specification.

Our said invention has for its object to arrange and combine the parts of engines for starting or turning large engines in an improved manner, and especially so that the small engine will automatically become disengaged from the large engine on the latter acquiring a greater motion than that corresponding to theniotion ofthe small engine.

In carrying out our said invention a duplextoothed wheel or worin-wheel pinion is arranged to act ou a toothed part ofthe iiy-wheel ofthe large engine or on any convenient toothed wheel of the large engine, and is itself acted on by a worm on the crank-shaft of the small engine. The shaft ofthe worm-wheel pinion can slide in guides parallel to the shaft on which the worm is fixed, the extent of sliding movement provided for being sufficient for putting the worm-wheel pinion into gear with or out of gear from the toothed Wheel of the large engine. A brake isarranged for applying a slight frictional resistance to the worm-wheel pinion at the part opposite to that acted on by the worm, and when the brake is applied and the small engine set in motion the worin-wheel pinion'is made to move into gear with the toothed wheel ofthe large engine, and it remains in gear therewith and turns the large engine until the increasing speed of the latter so alters the strains as to make the wormwheel pinion recede out of gear from it.

In the accompanying explanatory drawings, Figure 1 is avertical section of the small engine and of part of the toothed wheel of the large engine. Fig. 2 is an end elevation of the worm-wheel pinion and part of the framing of the small engine, and Fig. 8 is a horizontal section corresponding to Fig., 1.

In these drawings the same reference-nu merals are used to mark the same orlikeparts wherever they are repeated.

The small engine comprises two cylinders, 4 5, with their accessories and carried by a frame, 6, bolted down to a sole-plate, 7. The cylinders 4 5 are arranged to act on cranks at right angles on a horizontal shaft, 8, which has keyed on one end of it a worm, 9. In gear with this worm 9 there is a duplex-toothed Wheel or worm-wheel pinion, 10, fixed on a short axle or shaft, 11, having journals projecting on each side and entered into horizontal guideslots 12, formed in `blocks or bushes 13, which are fixed in the sides of the frame 6. The vworm-wheel pinion 10 is always turnedin the direction of the arrow, and its teeth are made with the sides acted on by the worm 9 of the usual shape or worm-wheel teeth, while the other sides are shaped like ordinary pinion or spur-wheel teeth.

W'hen the Vworm-wheel pinion 10 is in the position in which it is shown in Fig. 1, it is in gear with the internally-toothed part 14 of the fly-wheel of the large engine, (or it might be any suitable toothed wheel ofthe large engine,) and with the parts in this position the small engine will start or turn the large engine. Vhile the small engine acts on or drives the large engine, and until the largeengine acquires from its own action such a speed'as to be no'longer driven by the small engine, the strains are such as to keep the worm-wheel. pinion in gear; but on the speed of the large engine increasing, the Worm-wheel pinion 10, tending to turn faster than the worm is driving it, rolls back along the worm, its shaft 11. moving back along the guide-slots 12, andit moves out of gear from the fly-wheel teeth 14. To insure that the worm-wheel pinion 10 will move completely out ofgear, springs 15 are applied to its shaft 1l.

When the worm-wheel pinion 1d is not in tional resistance is applied to a part of the Worm-wheel pinion diametrically opposite to that at which the worm 9 acts on it. This may be done in various ways; but in the eX- ample delineated a small brake-block, 16, is fitted in a guide inone side of the frame 6, and a hand-lever, 17, centered on astud Xed in the frame 6, is connected to the brake-block and can be used for forcing it against the side of the rim of the worm-whee1 pinion 10. A projection, 18, is cast on theinside of the frame at the other side of the worm-wheel pinion 10, to resist the pressure applied by means of the brake-block 16, the wheel being nipped be;

tween the projection 18 and the brake-block 16. On the frictional resistance being applied in this way and on the small engine being set in motion the worm 9 causes the worm-wheel pinion 10 to move into gear with the y-wheel teeth 14 of the large engine, and to start or turn the large engine.

What we claim as our invention is- 'Ihe combination of a worm driven by a small engine with a worm-wheel pinion having its center capa-ble of movement parallel to 25 the axis of the worm, and by such movement entering into gear with or receding out of gear from the toothed fly-wheel or other wheel of a large engine, substantially as and for the purposes hereinbefore described.

In testimony whereof we have signed our names to this specification in the presence of two subscribing witnesses.

WILLIAM HARGREAVES. VILLIAM INGLIS.

Witnesses:

OHAs. DUoKERs, JOHN B. PARKINsoN,

Both of Bolton. 

